title: The constancy of the relation between pressure and flow in the upper urinary tract of the pig.
abstract: The long-term constancy of the pressure-flow relationship of the upper urinary tract of the pig was studied in 8 pyeloureteral units and the short-term constancy in 10 units. No constancy was found for neither pelvic baseline pressure nor for pelvic perfusion pressure with an interval of 10 weeks. Pelvic pressure is a very unstable parameter with time but variating within the normal range. Contrarily, a good constancy was found for both baseline and perfusion pressure when 3 consecutive pressure-flow procedures performed with an interval of 30 min were compared to each other. It is concluded that the short-term constancy of the pressure-flow relationship may allow in vivo investigations of the function--if any--of drugs upon the pyeloureter.
authors.affiliation: Surgical Department, Esbjerg Central Hospital, University of Aarhus, Denmark.
authors.forename: L
authors.initials: L
authors.lastname: Krebs
authors.forename: J
authors.initials: J
authors.lastname: Mortensen
mesh_terms: D000818:Animals; D004231:Diuresis / Q000502:physiology; D007682:Kidney Pelvis / Q000502:physiology*; D011312:Pressure; D013552:Swine / Q000502:physiology*; D013997:Time Factors; D014513:Ureter / Q000502:physiology*; D014563:Urodynamics / Q000502:physiology*